Self-opening die.



0. A; SMITH. SELF OPENING DIE.

APPLICATION FILED NOV.15, 1912 1 085 762 I Patented Feb. 3, 1914 2SHEETS-SHEET 1.

QXMimeoacs: 66 a 1 anuclflfoz 0.5112024. SmiZ/z.

0. A. SMITH.

SELF OPENING DIE. 7 APPLICATION FILED NOV. 151912.

' Patefit'ed Feb. 3, 1914.

'1 2 SHEETS-SHEET 2.

qmiihaaocs & 'wwww UNITED STATES ATENT @Fhlfi'hl.

USGAB 3. SMITH, F CLEVELAND, OHIO, ASSTGNOR TO 'THE NATIONAL-ACME MANU-I FACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO-SELF-OPENING DIE.

To all whom it one 1 concern: I Be it lmmv-n that I, Oscaa A. Sirrr-H. acitizen of the United States, residing at Gleveland, in the county ofCuyahoga and State of Ohio have invented certain new and usefull-mprov-emelrts in eli-Opening Dies. of which the following is aspecification. A

' This invention relates to improvements in $0 ill reading (lies of thecharacter known as .aelflopening d-ies,}tl ie object of the inventionbeing to provide a die which will allow a thread to be cut to theshortest length practicable in any desired apitch without the for wardtravel of the chasers when opening and which will insure the opening ofthechasers instantaneously instead of gradually and thus avoid themailing of a larger or tapered threa-dat the extreme end of the out, andin wh-ioh the die may be set or closed without any appreciable wear orfriction on the cam '01- surfaces of the chasers or cutter blades.

A further object of the invention is the provision of a die having ilnroved means ,for allowing an eccentric 0r -oa-ting movement. of the bodyrelatively to the casing and to obtain this without the use of springs.

In the drawings aecmnpa-nying and for.m ing part of this specification,Figure 1 a perspective view of the improved die; Fig. 2 is a front endview thereof with the front cap partly removed; Fig. 3 is across-sectional view of the die with the chasers closed ior in theirthreading position; Fig. 4 is a view similar to that of Fig. 3-, butillu trating the chaser operating cam member in that position whichpermits the chasers to open; Fig. is a partly sectional perspeclive viewof, the front cap; Fig. (i is a perspective view of the die body; Fig. 7a perspective view of the chaseroperating cam member or disk; Fig. 8 isa perspective view of the die 'asing; Fig. 9 is a perspective view ofthe floating or eccentric coinpensating ring; Fig. 10 is a perspectiveview of the flanged shank or spindle by means of which the die isattached to the machine and also a view of the rear cap or ring forholding the floating ring shown in Fig. 9 and the flanged stein shown inFig. 10 assembled; Fig. 11 is a perspective view of the die chaser andits guidii'ig' block or plate; Fig. 12 is a detail View of a part of theit chaser operating cam member; Figs. 13' and of the drawings.

Specification of 'IiettersTatciit.

Application filed November 1-5, 1912. Serial 11%. 731,505.

(Patented Feb. 3, I914.

l4 show difl erent positions of the die chasers and the-cam operatingmember in the :operation of the die; Fig. 15 is a detail 'view of one ofthe screws used for holding certain parts of the die assembled; and-Fig. 16 a seot-iorml view taken in line 16-16, Fig. 2.

Similar characters ef reference indicate corresponding parts'th-roughout the figures 6'5 The =l7l-Il'BQCl1HQ-t00l in the preferredembodiment thereotf shown, comprises a the body having a reeirward'lyextending hollow or cylindricalshaii'k portion 3, and this die bodyfisprovided with a plurality of four guidew'ays 4c, 5, 6 and 7 extendingra- -dially thereof. The rear portions of these ways are grooved orundercut to form laterally extending recesses 8, and in each of the waysslides a die chaser or cutter 9, see Fig. 1l,--secured tea plate orblock9 which projects beyond the two side faces of the chaser and into itsrecesses -8. By means :of this construction the chaser-s are guided intheir opening and closing movements and are maintained against'depthwise movement axially of the die. Each of thesef ol-iasei."gi-iiding blocks 5) is provided with-projecting pins 10 in position toengage coil springs 11 loeated in openings 12 of the die body on 5 eachside of the die 'chasers. These springs are effective to shift theolaasers outwardly from the axis of the body. On one corner of the outerend of each of the plates '9 is formed a tapered cani projection l-i forthe purpose hereinafter explained. Each plate 9 has a locating pin tofit in an opening 13 of its chaser. The outer end of each chaser istapered circ-umterentially throughout the major portion thereof,- thatis. itzis tapered transversely or at a right angle to the axis of thedie, at 28, but this tapered Surface is straight axially, that isparallel with the axis of the die. In the rear of this tapered surface28 the chaser is stepped, as at 28', a predetermined depth lower thanthe surface 28,' and this surface 28 is also straight axially of thedie, such stepped surface having a square shoulder.

For closing the (lie Chasers suitable means In is provided, hereindesignated as'the die chaser operating means or member, or cam disk. andconsists of an axially bored disk 16 having forwardly extending arms 17squared on their outer ends or faces, as at of each arm. The shankportion 3 of the L die body extends through the bore of this cam disk16. 'Encircling this disk 16 and its forwardly extending arms 17 is thedie casing 19, which is also centrally bored to receive the shank 3 ofthe die body. Over the front edge of this casing 19 and secured to thedie body is a front axially bored cap 20. For holding the die body, thechaser operating cam disk and casing19 in proper assembled positionrelatively one to another, thereby to permit proper movement of thechaser operating cam disk relatively to the chasers, the die body isprovided with a pair of countersunk openings 21, the shoulders of whichare engaged 'by the heads of screws 22, see Fig. 15, which projectthrough the openings 21. The inner end of each of the openings 21 of thedie body is counter-bored.

by means of slots 16 provided in the disk 16, and through which .slots16 the smoothed ends of the screws 22 project so that the disk 16 isprevented from movement axially of the die. vIn other words,

when the screws 22 are turned into the rear" wall of the casing 19 thedistance from the inner sides of the washers 21 to the threaded portionsof the screws 22 is just enough longer to allow the cam disk to rotatewhile preventing movement thereof in the direc tion of the axis of thedie.

For adjnsting the chasers toward and from the work a suitable micrometerscrew 31 is provided extending diagonally through the die casing 19 andheld in any desired adjustment by a clamp washer and screw 38' housed inthe periphery of the casing 19. On the rear wall of the cam disk 16 isastud or pin 31 so placed as to come into contact with the micrometerscrew 31. In the rear wall of the casing is milled an elongated curvedgroove to receive this stud 31 and a vcoil spring 40. The pressure ofthe spring 40 against stud post 81 of the cam dislfa16 forces this camdisk 16 against its adjusting screw 31', or in other words holds the camdisk in whatever position it is adjusted to by the micrometer screw,that is to say, when .the micrometer screw is op erated it will turn thecam disk and so carry its stud 31 a predetermined distance in theelongated groove and hold it there, so that when the cam disk is rotatedaway from the end of the micrometer screw and released it canreturn onlyas far as the end of the screw. A. handle 30 passes through an elongatedslot in the periphery of the casing 19 and is screwed into the camoperating disk 16. A. pin 24 is fastened to the shank 3 of the die body2 a suitable distance from the outer side of the rear wall of such bodyand the disk portion of the cam disk .16 has a recessed and tapered camportion 21 in position to engage this pin 2 L of the die body shank 3 ata predetermined time when the cam disk 16 is rotated.

:To set the die the handle 30 is rotated to the right from the positionshown in Fig. 13, thus bringing the tapered edges 18, seeFig. 7, of thearms 17 of the cam disk 16 into engagement with the projecting camportions 14 of the chaser plates 9, which action forces the chasersinward. By reason. of the fact that the cam portions 14 of the plates 9are relativelyhigh, the movement of the chasers inward is sufficient toclear the outer ends or surfaces 28 of the chasers from the forward endsof the arms 17, so that the chaser surfaces 28 by this movement of thecam disk are carried inward and therefore away from the forward ends'ofthe armsl'l' of the cam disk 16. This movement of the handle to theright carries the cam disk 16 into position to-bring the cam portion 24thereof into contact with the pin 24' on the die body comes into contactwith this pin 24: it will of course draw back the die body and thechasers carried thereby into the 'casing 19 and so bring an extremelysmall portion of the rear edges 28 of the chasers under the extremeouter ends of the arms 17 of the cam disk, whereupon, on releasing thehandle, the spring 40 returns the cam disk automatically to its originalposition to which it has been adjusted by the micrometer screw. In Fig.14 the full line position of the handle 30 and the arm 17 shows such arm17 returning to its set position to the left, which is indicated by thedotted position of the handle 30, during which returning movement, byreason of the fact that the die body and the chasers have been drawnback in the manner just stated, the outer ends of the arms 17 merelyshift circumferentially over -the tops of the surfaces 28 of the chasersand hold them in their set position. As the surfaces 28 are straightaxially, that is.

the chasers are spaced from the extreme.

outer ends of the cam disk arms 17 and during this movement thecoiiperation of the pin 24 and tapered cam surface 2e draws the die bodywith its chasers backward into the casing and thus draws the rear outerends of the chaser surfaces 28 under the-extreme outer ends of the arms17. In other words, when the tapered surfaces 18 of the arms 17 of thecamdislt are shifted by means of the handle into engagement with thesurfaces 14- the chasers are shifted toward theaxis of the die to agreater extent than is neces sary, so that when the die body is drawnback :in the manner described the outer ends under the extreme outerends of the arms 1 the tapered surfaces 28 of such chaser outer endscontrolling. in connection with the micrometer screw, the particularsetting oi' the dhasers to cut the desired thread. lY-heu the shank '32and the -asiug 19 'to which it is attached has been arrested during itsforward travel in the usual manner the-cmit-inued forward 'trave'l'ofthe die body a very slight distance of course pulls the chaser surfaces28 from under the extreme outer ends 1T of the arms 17 of the cam disk16. so that without the further forward travel of the chasers themselvesindependently of the body, and by means of the straight stepped drop atthe rear of the tapered surfaces .28 of the chasers. the chasers areinstantaneously released from the forward ends of the arms 17. Byoperating the micrometer screw out or in the cam disk is rotated forwardor backward, thus adjusting the chasers to the desired depth of cut. ashereinbefore explained.

The floating or eccentric compensating mechanism is constructed asfollows: The rear of the casing 19 is bored to Form a chamber to receivea disk 29, the diameter of which is machined to a predetermined sizesmaller than the bore of the casing. In the edges of this disk arelocated four angula'r recesses '38 equally spaced. Fitted to slide intwo oppositely located recesses are squared studs 37 carried by the wallof the chamber. The flange or disk of the stem 32 by means of which thedie is secured in the machine or turret head also has two square studs36 located in such position as to fit into the two remaining recesses ofthe disk 29. The diameter of the flange of this stem 32 is also machinedsmaller than the bore of the chamber a predetermined size. \Vhen theseparts are assembled in the chamber or bore of the casing 19) they areheld in place by a ring 34, which is bored to slip over the stem 32 andfastened to casing 19 by suitable screws. The difference in diameterbetween the disk 2-9 and the flange of stem and the diameter of the boreor chamber of the casing 19 determines the. amount of eccentric orfloating movementthe die will have, by reason of the fact that the pinsfit loosely in the slots.

From the: foregoing it will be observed that the chasers are closed-byrotating the chaser closing in-ea nslinstead of shifting it or surfacesof the chasers will be drawn axially, and that during this rotation ofthe chaser closing means the notch 2% comes into position to engage thepin 2-1;, so that the inclined or tapered face of this notch 24 engagesthe, pin and draws back the body carrying the Chasers and so brings theends of the chasers under the ends of the forwardly projecting arms 17of the cam disk and holds them in their set position, this being donewithout an Y appreciable friction or wear on the ends of the chasers orcam for operating them. \Vhen the die has. been properly fed forwarduntil the usual stop, not shown limits the further forward movement ofthe die casing and stem 32 the further pull on the chasers pulls thebody forward an extremely small distance, releases the outer ends of thechasers from the ends of the projecting arms and allows them to open inthe usual manner, without any forward movement of the chasersindependently ofthe die body, so that the chasers will instantaneouslyfly open. This is an advantage of extreme importance over that form ofdie where the ends of the arms 17 are tapered, or where the outer endsof the chasers are tapered in the direction of the axis of the die, forin such a construction the chasers had to be pulled continuously forwarda sufficient distance to permit them to be opened and there wastherefore a gradual opening of the chaser-s, which had a tendency to outa larger tapered thread at the extreme end of the threaded port-ion,whereas in the present case the chasers open instantaneously and thuseliminate this dis advantage.

,Among the advantages of the present const ructiol-i' are the following:Thatwhen the chasers are being set there is no wear on the ends of thechaser-s, and the wear on the outer ends of the chasers or surfaces 28and the ends of the arms when the die opens or releases is very slightcompared with that wear which takes place in the set-ting of the diechaser-s. Fllltllfill'llOle, the chascrs ha ving no forward movementthemselves when opening, it follows that the die can cut very shortthreads, as the chasers practically instantaneously open. Further. thegrooved means for obtaining an eccentric compcm sating or floatingmovement is more universal and better, as it does not depend on Vpartcomprising the die body and the chasers, the rear of which die bodyis in engagement with the front face of the cam disk 16 \vlIe-nthechasers are set and spaced there- 1. A threading die comprising a fixedpart and a movable die body, shiftable thread cutting means carried bythe body, and die set-ting means effective to shift the cutting meansand including means effective to draw the die body toward the fixed partthereby to finally set the thread cutting means.

A threading die comprisin a fixed part and a movable die body, shi tablethread cutting means carried by the body, and rotary die setting meanseffective on the rotation thereof to shift the cutting means andincluding positively actingmeans effective to draw the die body toivardthe-fixed part thereby to finally set the thread cutting means.

3. A threading die comprising a fixed part and a movable die body,shiftable thread cutting means carried by the body, and die settingmeans effective to shift the cutting means and including cam formedmeans effective to draw the die body toward the fixed part thereby tofinally set the thread cutting means.

42. A threading die comprising a fixed part and a movable die body,shiftable thread cutting means carried by the body, die setting means efective to shift the cutting means and inciuding positively acting meanscarried by the d ie and effective to draw the body toward the fixedpart, and means for bringing said positively acting means intoengagement whereby the thread cutting means will be finally set on the d'avving of the (lie body toward its fixed part.

5. A threading die comprising a fixed partand a movable die body,shiftable thread cutting means carried by the body, die setting meanseffective to shift the cutting means and including cam formed memberseffective to draw the die body toward the .fixed part, and means forbringing ,-aicl'can1 formed members into engagement whereby the threadcutting means willbe finally set on the drawing ofthe die body towardthe fixed part.

'6. A threading die comprising a fixed'part and a movable die body,shiftable thread cutting means carried by the body, and die settingmeans effective to shift the cutting means and including rotatable'means carried by the fixed part and having means co operating with apart of the body to draw said body part thereby to finally set thethread cutting means. 7. threading die'ccmprising a part and a movabledie body, shiftable thread cut ting means crried by the body, and diesetof said"inen1ber to shift the cutting me ting means effective toshift the cutting means and including rotatable means ried by the fixedpart and having positively acting means cooperating with a part of thebody to draw said body toward the fixed part thereby to finally set thethread cutting means.

8. A threading die comprising a. fixed part and a movable die body,shiftable thread cutting means carried by the body, and die settingmeans effective to shift the cutting means and including rotatable meanscarried by the fixed part and carrying cam formed means cooperating Witha part of the body thereby to draw the body toward the fixed part andfinally set the thread cutting means.

9. A threading die comprising a fixed part, a body axially movablerelatively thereto, shiftable thread cutting members carried by saidbody and each having a cam sur face extending at an angle to the axis ofthe die and a stepped end having a part thereof parallel with the axisof the die, said cam surface projecting beyond said parallel surface, arotatable member carried by said fixed part and effective to engage saidcam surface and shift the cutting members in.- ivardly, and positivelyacting means carried by the body and rotatable member wherein on therotation of said member to shift the cutting members inwardly the oiebody will be drawn toward the fixed part thereby to bring the parallelsurfaces of the cutting members under the rotatable member to suchcutting members.

10. A threading die comprising; a casing, a

body axially movable therein shiftablethread cutting members carried bysaid body and each having a cam surface extending at an angle to theaxid of the die and a stepped end having a part thereof parallel withthe axis of the die, said cam surface projecting beyond said parallelsurface, a rotatable member carried within the casing and eft'ec tivejtoengage said cam surface and shiftthe cutting members inwardly, andpositively acting means carried by the body and rotatable member wherebyon the rot inwardly the die body will be drawn within the casing therebyto bring the arallel surfaces of the cutting members un er the rotatablemen iber to set such cutting members.

11. A threading die comprising a fixed part, a. body axially movablerelatively thereto, sbiftable thread cutting members carried by saidbody and each having a cam surface extending at an angle to the axis ofthe die and a stepped end having a part thereof parallel with the axisof the die, said cam surface projecting; beyond said parallel surface, arotatable member carried by said fixed part and effective to engage saidcam surface and shift the" cutting members in= Wardly, and positivelyacting means comprising a pin and a recessed cam surface carfied by thebody and rotatable member whereby on the rotation of said member toshiftthe cutting members inwardly the die bod will be drawn toward thefixed part thereby to bring the parallel surfaces of the cutting membersunder the rotatable membet to set such cutting members. I

12. A threading'die comprising a casing, a die body, a plurality ofchasers shiftably supported by said die body, each of said chasershaving a surface tapered at right angles to the axis of the die andparallel with the axis of the die and also having a stepped surface inthe rear thereof and. in the rear of said stepped surface a cam surfaceprojecting beyond such parallel surface, and a rotatable member withinthe easing having a plurality of parts each to engage one of said camsurfaces. and shift the chasers toward the axis of the die andbeyondtheir set positions, said rotatable memher and body having means forthen drawing one of said parts toward the other to have the other ofsaid parts of said rotatable member engage the parallel surfaces of thechassis.

13. A threading die comprising a casing, a diebody, a plurality ofchasers shift-ably supported by said die body, each of said cha'sershaving a surface tapered at right angles to the axis of the die andparallel with the axis of the die and also having a stepped surface inthe rear thereof and in the rear of'said stepped surface a cam surfaceprojecting beyond said parallel surface, and a rotatable member withinthe casing having a plurality of forwardly projectingarms correspondingin number with the number of chasers, each of said arms having a surfaceto engage one of said cam surfaces and shift the chasers toward the axisof the die and beyond their set positions, said rotatable member andbody having means for then drawing one of said parts toward the other tohave the ends of saidarms engage the parallel surfaces of the chasers.

'14. A shiftable thread cutting members carried by said body, arotatable member having a part cooperating with said thread cuttingmembers and a part cooperating with said body,

and means for rotating said member there- 55 by to shift .the cuttingmembers inwardly and then draw the same with the body and said rotatablemember one axially toward the other and into engagement thereby to setthe cutting members.

15. A threading dic including an axially movable body, shiftable threadcutting mem-' bers carried by said blidy, arotatable member having apart cooperating with said thread cutting members and a positively acing part cooperating with a part of said body,

threading die including a body,

and means for rotating said member thereby to shift the cutting membersinwardly and then draw the same Witht'he body axially into engagementwith said'rotatable member thereby to set the cutting members.

16. A threading die including an axially movable body, shiftable threadcutting members carried said body and having a cam surface extending atan angle to the axis of the body and a surface parallel with'the axis ofthe body and beyond which said cairn surface extends, a, rotatablemember having a part co iperating. with said cam surface and a camsurface coiiperating with a part of the body, and means for rotatingsaid member therebyto shift the cutting members iiiwardly and then drawthe same with the body axially of said cutting members into engagementto bring the parallel surfaces M with said rotatable member thereby toset i the cutting members.

17. A threading die including an axially movable body, shiftable threadcutting members carried by said body, a rotatable member having a partcooperating with thread cutting members and a part cooper-at ing withsaid body, and means for rotating Said member thereby to shift thecutting members inwardly beyond their set position and simultaneouslyshifting the same With the body axially of the die and thereby effectengagement thereof with the cutting members on the return of suchcutting members to their set position.

18. A threading die including an axially p movable body, shiftablethread cutting mem bers carried by said body, a rotatable nie'mberhaving apart cooperating withisaid thread cutting members and a partcooperating with said body, means for rotating said member thereby toshift the cutting mem bers inwardly beyond their set POSltlOIlfllldsimultaneously shifting the same with't-he body axially of the die andthereby effect engagement thereof with the cutting mem bers on thereturn of such cutting members to their set position, and means foradjusting the rotatable member circumferentially.

19. A threading die comprising a casing, a die body, a plurality ofchasers shiftably supported by said die body, chasers having a surfacetapered at right angles to the axis of the die and parallel with theaxis of the die and also having a stepped surface inthe rear thereof andin the rear of said stepped surface a cam sur face projecting beyondsuch parallel surface, a rotatable member within the casing having aplurality of parts each to engageone of said cam surfaces and shift thechassis to Ward the axis of the-die and beyond their set' positions,said rotatable member and body having means for then drawing one of saidparts toward the other to have other each of said parts of saidrotatable member engage the parallel surfaces of the Chasers, and meansfor adjusting the rotatable member circumferentially.

20. A chaser for a die, having a cam surface extending in one directionand a stepped surface having a portion extending at an angle to said camsurface and parallel with the axis of the die, the cam surfaceprojecting beyond said parallel surface.

21. A chaser for a die, having a stepped end provided with a surfaceparallel with the axis of the die and also having a cam surface locatedat an angle to said parallel surface, one of said surfaces projectingbeyond another. I 1

.22. A chaser for a die having g a broad guide plate provided Witha camsurface, said chaser having a stepped end having a surface located at anangle to said cam surface and parallel with the aiiis of the die,

one: of said surfaces projecting beyond another.

23. A chaser for a (he, having a broad guide plate provided with a camsurface, said chaser having a stepped end having a surface located at anangle to said cam surface and parallel with the axis of the die, saidcam surface projecting beyond said parallel-surface.

24;. A chaser for a die, having a separable broad guide plate secured tothe back thereof and provided with a cam surface, said chaser having astepped end provided with 'a surface at an angle to said cam surface andparallel with the axis of the die, one of said surfaces projectingbeyond another.

'25. A chaser for a die, having a separable broad guide plate secured tothe back thereof and provided with a cam surface, said chaser having astepped end provided with a surface at an angle to said cam surface andparallel with the axis of the die, said cam surface extending beyondsaid parallel surface.

26. A chaser for a die, having a separable I broad guide plate securedtothe back thereof and provided with a cam surface. said chaser having astepped end provided with a surface at an angle to said cam surface andparallel with the axis of the die, said cam surface extending beyondsaid parallel surface and said cam surface being located at one cornerofsaid plate.

27. A chaser for a die, comprising a plate having at one corner a camsurface, the chaser having a surface located below and at an angle tosaid cam surface and parallel with the axis of the die.

- 28. A chaser for a die, having a guide plate provided with a camsurface at one corner thereof, the chaser having a stepped endprovided'Wit-h a surface located at an t emes the axis' of the die, saidcam surface projecting beyond said parallel surface.

29. A threading die comprising abodyz chamber and provided with a pairof integral squared studs for insertion into another pair of saidangular recesses of the disk, and means for securing said partstogether. I

30. A threading die comprising a .body

and a casing, said casing having a chamber at its rear, a pair of diskslocated within said chamberand of predetermined smaller size than saidchamber, said disks and chamber wall having coiiperating angularrecesses and integral squared studs, and means for securing said partstogether and supporting means carrying one of said disks.

31. A threading die comprising a body and a casing, said casing having achamber at its rear, a pair of disks located within said chamber and ofpredetermined smaller size than said chamber, said disks and chamllerwall having cchperating angularrecesses and. integral squared studs, allof the re cesses being carried by one of said members and the studs bythe other two members, means for securing said parts together, andsupporting means carrying one of said ;disks.

82. A threading die comprising a body and a casing, said casing having achamber at its rear, a pair of disks located Within said chamber and ofpredetermined smaller size than'said chamber, said disks and chamberwall having coiiperating angular recesses and integral squared studs,all of the recesses being carried by that disk which is located,

securing said parts together, and supporting.

ieans carrying one of said disks.

A threading die comprising a casing a body, shiftable chasers carried bythe body, a rotatable member carried by the easing for setting saidchasers, a pin carried by the rotatable member, a spring carried by thecasing for engaging one side of said pin, and a micrometer screw forengaging the opposite side of and adjusting said pin and therebyadjusting said rotatable member to compress said spring, the springholding the pin in engagement with the micrometer screw.

34. A threading die comprising a casing and a body, shiftable chaserscarried by the body, a rotatable member carried by the easing forsetting said chasers, a pin carried by the rotatable member, a coiledspring carried by the casing for engaging said pin. and a micrometerscrew for adjusting said pin and thereby said rotatable member tocompress said spring, said pin extending rearwardly of said rotatablemember and said casing having in its rear wall an elongated curved slotfor the reception of said spring and into which slot said pin projects.

35. A threading die. comprising a fixed part and a movable (lie. body,shiftable thread cutting means carried by the body, rotary meanseffective to shift the thread cutting means toward the axis of the die,and means effective to draw the die body toward the fixed part therebyto hold the thread cutting means in its operative position.

36. A threading die comprising a fixed part and a movable die body,shiftable thread cutting means carried by the body, rotary meansefi'ective to shift the thread cutting means toward the axis of the die,and means effective to draw the die body toward the fixed part therebyto hold the .thread cutting means in its operative position, said rotarymeans and thread cutting means having c0- operating cam surfaces.

37. A threading die comprising a fixed part and a movable die body,shiftable thread cutting means carried by the body,

rotary means eli'ective to shift the thread cutting means toward theaxis of the die during the rotation thereof in one direction, and meansefi'ectivcjto draw the die body toward the fixed part during therotation of said rotary means in the opposite direction thereby to holdthe thread cutting means in its operative position.

:38. A threading die comprising a die body, a casing for said bodyhaving a rear wall, a flanged spindle, and a coupling disk interposedlietn'eeirtlle spindle flange and the rear wall of Said casing, saidrear wall, spindle flange and interposed disk Inn-iii?! interlockingportions rotatably connecting them.

Signed at Cleveland, Ohio, this 12th day of November. 1912.

USCAR bMlTH.v Witnesses Part, E. RYAN. 5, J OHN B. BLUE-l; f lm;

